<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Vue3加减计算器</title>
  <script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
</head>
<body>
<div id="app">
  <button @click="increment">increment</button><br/>
  <input type="number" v-model="count"><br />
  <button @click="decrement">decrement</button>
</div>
<script>
  const obj = {
    data() {
      return {
        count:0
      }
    },
    methods: {
      increment() {
        this.count++
      },
      decrement() {
        if (this.count > 1) {
          this.count--
        }
      },
    },
  };
  Vue.createApp(obj).mount('#app');
</script>
</body>
</html>